One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(17,18,23,26,22,24,21,32)(19,27,25,30,28,20,29,31)(1,3,6,2)(4,7,5,8)(9,11,12,15)(10,13,14,16)(18,24)(19,28)(25,29)(26,32)(10,14)(11,15)(17,19)(18,20)(21,29)(22,28)(23,25)(24,27)(26,31)(30,32) involution — undirected(1,4,6,5)(2,7,3,8)(10,14)(13,16)(17,20,21,30,22,27,23,31)(18,25,32,19,24,29,26,28)(1,5,6,4)(2,7,3,8)(17,21,22,23)(18,26,24,32)(19,25,28,29)(20,30,27,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.